False ceilings system composed with self supporting linear strips Type METALSCREEN "LD-RAC SELF SUPPORTING" height mm.29 closed without joint gap width mm.200 or mm.300 (width and colour choosed by the consultant) aluminium prepainted thickness mm.0,6. The Type METALSCREEN "LD-RAC SELF SUPPORTING" strips will be installed lay-on the perimetrical wall angle frames “L” section Art. RA with connection joint. The strips must be height mm.29 and with the renforced bevelled edges to obtain a perfect complanarity of the final result of the ceilings. To obtain the best soundproofing result the Type METALSCREEN "LD-RAC SELF SUPPORTING" strips must be perforated with holes diameter Ø mm.3 or Ø mm.2 on the total surface with acoustical “TNT” non vowen textile thermal applied on the back of each strip.